Thermo Scientific Dionex Aquion RFIC Operator's Manual page 97

Thermo Scientific
Figure 32. Removing the piston rinse seal from the seal guide
c. Pull the seal off the end of the piston shaft and remove the piston from the seal guide.
3. Hold the new piston rinse seal (P/N 048722) with the grooved side facing up.
4. Using your fingertip, gently press the piston rinse seal into the seal guide until the edge of
the seal is below the surface of the seal guide.
IMPORTANT The piston rinse seal is made of soft plastic. Do not press on the seal
with anything hard or sharp, including your fingernail. If the seal is nicked or gouged,
it will not seal properly and may result in leaks.
5. Place the new O-ring (P/N 059283) into the groove in the seal guide.
6. Remove the O-ring from the groove in the flat side of the spacer and replace it with the
new O-ring (P/N 014895).
7. In one hand, hold the seal guide with the O-ring and piston rinse seal facing up (to
prevent the O-ring from falling out). In your other hand, hold the spacer with the cavity
facing down.
8. Gently press the seal guide into the cavity in the spacer until it is fully seated.
To remove the piston seal from the pump head

1. For the primary pump head: Install a 10-32 fitting plug (P/N 042772) in the outlet
check valve. Tighten the plug.
For the secondary pump head: Install a 10-32 fitting plug (P/N 042772) in both the
inlet and outlet ports. Tighten the plugs.
2. Close the priming valve.
3. Using a squirt bottle or a plastic syringe, fill the head cavity with deionized water through
the piston opening (see
deionized water that meets the specifications listed in
IC" on page vi.
Figure 33). Use ASTM filtered, Type I (18 megohm-cm)
Replacing a Pump Piston Seal and Piston Rinse Seal
"Deionized Water Requirements for
Dionex Aquion RFIC Operator's Manual
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Service
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